linux-kernel - [PATCH 1/3] arm64/boot: Move init_pgdir[] into __pi

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20250503112137.1962910-6-ardb+git@google.com>
Date: Sat,  3 May 2025 13:21:39 +0200
From: Ard Biesheuvel <ardb+git@...gle.com>
To: linux-arm-kernel@...ts.infradead.org
Cc: linux-kernel@...r.kernel.org, will@...nel.org, catalin.marinas@....com, 
	mark.rutland@....com, Ard Biesheuvel <ardb@...nel.org>, Yeoreum Yun <yeoreum.yun@....com>
Subject: [PATCH 1/3] arm64/boot: Move init_pgdir[] into __pi_ namespace

From: Ard Biesheuvel <ardb@...nel.org>

init_pgdir[] is only referenced from the startup code, but lives after
BSS in the linker map. Before tightening the rules about accessing BSS
from startup code, move init_pgdir[] into the __pi_ namespace, so it
does not need to be exported explicitly.

Signed-off-by: Ard Biesheuvel <ardb@...nel.org>
---
 arch/arm64/include/asm/pgtable.h | 2 --
 arch/arm64/kernel/image-vars.h   | 2 --
 arch/arm64/kernel/pi/pi.h        | 1 +
 arch/arm64/kernel/vmlinux.lds.S  | 4 ++--
 4 files changed, 3 insertions(+), 6 deletions(-)

diff --git a/arch/arm64/include/asm/pgtable.h b/arch/arm64/include/asm/pgtable.h
index d3b538be1500..6a040f0bbfe1 100644
--- a/arch/arm64/include/asm/pgtable.h
+++ b/arch/arm64/include/asm/pgtable.h
@@ -754,8 +754,6 @@ static inline bool pud_table(pud_t pud) { return true; }
 				 PUD_TYPE_TABLE)
 #endif
 
-extern pgd_t init_pg_dir[];
-extern pgd_t init_pg_end[];
 extern pgd_t swapper_pg_dir[];
 extern pgd_t idmap_pg_dir[];
 extern pgd_t tramp_pg_dir[];
diff --git a/arch/arm64/kernel/image-vars.h b/arch/arm64/kernel/image-vars.h
index 5e3c4b58f279..a0977f7cd3ec 100644
--- a/arch/arm64/kernel/image-vars.h
+++ b/arch/arm64/kernel/image-vars.h
@@ -56,8 +56,6 @@ PROVIDE(__pi_memstart_offset_seed	= memstart_offset_seed);
 
 PROVIDE(__pi_init_idmap_pg_dir		= init_idmap_pg_dir);
 PROVIDE(__pi_init_idmap_pg_end		= init_idmap_pg_end);
-PROVIDE(__pi_init_pg_dir		= init_pg_dir);
-PROVIDE(__pi_init_pg_end		= init_pg_end);
 PROVIDE(__pi_swapper_pg_dir		= swapper_pg_dir);
 
 PROVIDE(__pi__text			= _text);
diff --git a/arch/arm64/kernel/pi/pi.h b/arch/arm64/kernel/pi/pi.h
index c91e5e965cd3..38a908d048e8 100644
--- a/arch/arm64/kernel/pi/pi.h
+++ b/arch/arm64/kernel/pi/pi.h
@@ -22,6 +22,7 @@ static inline void *prel64_to_pointer(const prel64_t *offset)
 extern bool dynamic_scs_is_enabled;
 
 extern pgd_t init_idmap_pg_dir[], init_idmap_pg_end[];
+extern pgd_t init_pg_dir[];
 
 void init_feature_override(u64 boot_status, const void *fdt, int chosen);
 u64 kaslr_early_init(void *fdt, int chosen);
diff --git a/arch/arm64/kernel/vmlinux.lds.S b/arch/arm64/kernel/vmlinux.lds.S
index e73326bd3ff7..73fa57f341b0 100644
--- a/arch/arm64/kernel/vmlinux.lds.S
+++ b/arch/arm64/kernel/vmlinux.lds.S
@@ -321,9 +321,9 @@ SECTIONS
 	BSS_SECTION(SBSS_ALIGN, 0, 0)
 
 	. = ALIGN(PAGE_SIZE);
-	init_pg_dir = .;
+	__pi_init_pg_dir = .;
 	. += INIT_DIR_SIZE;
-	init_pg_end = .;
+	__pi_init_pg_end = .;
 	/* end of zero-init region */
 
 	. += SZ_4K;		/* stack for the early C runtime */
-- 
2.49.0.906.g1f30a19c02-goog